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Each M-type memory unit will increase the base memory

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Each M-type memory unit will increase the base memory [#permalink] New post 14 Dec 2009, 23:56
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Each M-type memory unit will increase the base memory capacity of a certain computer by 3 megabytes. What is the base memory capacity, in megabytes of the computer?

(1) 2 M-type memory units will increase the computers base memory capacity by 300 percent
(2) The memory capacity of the computer after 2 M-type memory units are added to the base memory capacity is 1.6 times the memory capacity of the computer after 1 M-type memory unit is added to the base memory capacity.
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Re: Data sufficiency...pls help [#permalink] New post 15 Dec 2009, 00:18
IMO D

from q stem we get
if base mem=x
1M will inc base mem by 3---->x+3
2m--->2x+6

s1) [(2x+6)-x]/x=3 ---> solving x=3 hence suff
s2) 2x+6+x=1.6(x+3+x)---->solving x=6 hence suff
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Re: Data sufficiency...pls help [#permalink] New post 15 Dec 2009, 00:44
IMO D

s1) one eqn and one variable hence suff
s2) same one eqn and one variable hence suff
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Re: Data sufficiency...pls help [#permalink] New post 15 Dec 2009, 04:38
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delta09 wrote:
Each M-type memory unit will increase the base memory capacity of a certain computer by 3 megabytes. What is the base memory capacity, in megabytes of the computer?

(1) 2 M-type memory units will increase the computers base memory capacity by 300 percent
(2) The memory capacity of the computer after 2 M-type memory units are added to the base memory capacity is 1.6 times the memory capacity of the computer after 1 M-type memory unit is added to the base memory capacity.

IMO D

from q stem we get
if base mem=x
1M will inc base mem by 3---->x+3
2m--->2x+6

s1) [(2x+6)-x]/x=3 ---> solving x=3 hence suff
s2) 2x+6+x=1.6(x+3+x)---->solving x=6 hence suff


Answer is D. But the above solution is not correct. The first indication of this is that the values of x from statement 1 and 2 are different. This never occur in GMAT.

Statements in DS never contradict, nor they are giving the different answers.

(1) x+6=4x --> x=2. Sufficient.

Note that increase by 300% equals to 4 times increase.

(2) x+6=1.6(x+3) --> x=2. Sufficient.

Answer: D.
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Re: Data sufficiency...pls help [#permalink] New post 15 Dec 2009, 08:26
Thank you, thank u Bunel, I got this one, but was cross checking.
Re: Data sufficiency...pls help   [#permalink] 15 Dec 2009, 08:26
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